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  1. List of Colorado area codes. Coordinates: 38.9972°N 105.5478°W. Clickable map of Colorado area codes in blue (with bordering states). [1] The U.S. state of Colorado is served by five telephone area codes of the North American Numbering Plan (NANP).

  2. Clickable map of Colorado area codes in blue (with bordering states). Area codes 303, 720 and 983 are telephone area codes in the North American Numbering Plan for the north-central portion of the U.S. state of Colorado.

  3. Coordinates: 40°00′54″N 105°16′14″W. For other uses, see Boulder (disambiguation). Boulder is a home rule city in and the county seat of Boulder County, Colorado, United States. [1] . With a population of 108,250 at the 2020 census, it is the most-populous city in the county and the 12th-most populous city in Colorado. [6] .

  4. Sep 1, 2017 · Boulder, CO Area Codes: List, Map, and Phone Lookup. The city of Boulder is in the state of Colorado. It has the following active area codes:

  5. Our area code lookup makes it easy to find area codes in Colorado. Includes area code listings of all Colorado area codes with corresponding cities.

  6. Boulder is in the foothills of the Rocky Mountains. The city's height is 5,430 feet (1,660 m). It is 25 miles (40 km) northwest of Denver. In 2020, there were 108,250 people living the City of Boulder. The Boulder Metropolitan Statistical Area has 330,758 people living in it. Boulder is famous for its history and its Western traditions.

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  8. Lookup area code information for BOULDER, CO. Get the NPA NXX (area code and prefix) as well as much more data for BOULDER, CO.

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